1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Test for s390x KVM_CAP_SYNC_REGS 4 * 5 * Based on the same test for x86: 6 * Copyright (C) 2018, Google LLC. 7 * 8 * Adaptions for s390x: 9 * Copyright (C) 2019, Red Hat, Inc. 10 * 11 * Test expected behavior of the KVM_CAP_SYNC_REGS functionality. 12 */ 13 #include <fcntl.h> 14 #include <stdio.h> 15 #include <stdlib.h> 16 #include <string.h> 17 #include <sys/ioctl.h> 18 19 #include "test_util.h" 20 #include "kvm_util.h" 21 #include "diag318_test_handler.h" 22 #include "kselftest.h" 23 24 static void guest_code(void) 25 { 26 /* 27 * We embed diag 501 here instead of doing a ucall to avoid that 28 * the compiler has messed with r11 at the time of the ucall. 29 */ 30 asm volatile ( 31 "0: diag 0,0,0x501\n" 32 " ahi 11,1\n" 33 " j 0b\n" 34 ); 35 } 36 37 #define REG_COMPARE(reg) \ 38 TEST_ASSERT(left->reg == right->reg, \ 39 "Register " #reg \ 40 " values did not match: 0x%llx, 0x%llx", \ 41 left->reg, right->reg) 42 43 #define REG_COMPARE32(reg) \ 44 TEST_ASSERT(left->reg == right->reg, \ 45 "Register " #reg \ 46 " values did not match: 0x%x, 0x%x", \ 47 left->reg, right->reg) 48 49 50 static void compare_regs(struct kvm_regs *left, struct kvm_sync_regs *right) 51 { 52 int i; 53 54 for (i = 0; i < 16; i++) 55 REG_COMPARE(gprs[i]); 56 } 57 58 static void compare_sregs(struct kvm_sregs *left, struct kvm_sync_regs *right) 59 { 60 int i; 61 62 for (i = 0; i < 16; i++) 63 REG_COMPARE32(acrs[i]); 64 65 for (i = 0; i < 16; i++) 66 REG_COMPARE(crs[i]); 67 } 68 69 #undef REG_COMPARE 70 71 #define TEST_SYNC_FIELDS (KVM_SYNC_GPRS|KVM_SYNC_ACRS|KVM_SYNC_CRS|KVM_SYNC_DIAG318) 72 #define INVALID_SYNC_FIELD 0x80000000 73 74 void test_read_invalid(struct kvm_vcpu *vcpu) 75 { 76 struct kvm_run *run = vcpu->run; 77 int rv; 78 79 /* Request reading invalid register set from VCPU. */ 80 run->kvm_valid_regs = INVALID_SYNC_FIELD; 81 rv = _vcpu_run(vcpu); 82 TEST_ASSERT(rv < 0 && errno == EINVAL, 83 "Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d", 84 rv); 85 run->kvm_valid_regs = 0; 86 87 run->kvm_valid_regs = INVALID_SYNC_FIELD | TEST_SYNC_FIELDS; 88 rv = _vcpu_run(vcpu); 89 TEST_ASSERT(rv < 0 && errno == EINVAL, 90 "Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d", 91 rv); 92 run->kvm_valid_regs = 0; 93 } 94 95 void test_set_invalid(struct kvm_vcpu *vcpu) 96 { 97 struct kvm_run *run = vcpu->run; 98 int rv; 99 100 /* Request setting invalid register set into VCPU. */ 101 run->kvm_dirty_regs = INVALID_SYNC_FIELD; 102 rv = _vcpu_run(vcpu); 103 TEST_ASSERT(rv < 0 && errno == EINVAL, 104 "Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d", 105 rv); 106 run->kvm_dirty_regs = 0; 107 108 run->kvm_dirty_regs = INVALID_SYNC_FIELD | TEST_SYNC_FIELDS; 109 rv = _vcpu_run(vcpu); 110 TEST_ASSERT(rv < 0 && errno == EINVAL, 111 "Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d", 112 rv); 113 run->kvm_dirty_regs = 0; 114 } 115 116 void test_req_and_verify_all_valid_regs(struct kvm_vcpu *vcpu) 117 { 118 struct kvm_run *run = vcpu->run; 119 struct kvm_sregs sregs; 120 struct kvm_regs regs; 121 int rv; 122 123 /* Request and verify all valid register sets. */ 124 run->kvm_valid_regs = TEST_SYNC_FIELDS; 125 rv = _vcpu_run(vcpu); 126 TEST_ASSERT(rv == 0, "vcpu_run failed: %d", rv); 127 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC); 128 TEST_ASSERT(run->s390_sieic.icptcode == 4 && 129 (run->s390_sieic.ipa >> 8) == 0x83 && 130 (run->s390_sieic.ipb >> 16) == 0x501, 131 "Unexpected interception code: ic=%u, ipa=0x%x, ipb=0x%x", 132 run->s390_sieic.icptcode, run->s390_sieic.ipa, 133 run->s390_sieic.ipb); 134 135 vcpu_regs_get(vcpu, ®s); 136 compare_regs(®s, &run->s.regs); 137 138 vcpu_sregs_get(vcpu, &sregs); 139 compare_sregs(&sregs, &run->s.regs); 140 } 141 142 void test_set_and_verify_various_reg_values(struct kvm_vcpu *vcpu) 143 { 144 struct kvm_run *run = vcpu->run; 145 struct kvm_sregs sregs; 146 struct kvm_regs regs; 147 int rv; 148 149 /* Set and verify various register values */ 150 run->s.regs.gprs[11] = 0xBAD1DEA; 151 run->s.regs.acrs[0] = 1 << 11; 152 153 run->kvm_valid_regs = TEST_SYNC_FIELDS; 154 run->kvm_dirty_regs = KVM_SYNC_GPRS | KVM_SYNC_ACRS; 155 156 if (get_diag318_info() > 0) { 157 run->s.regs.diag318 = get_diag318_info(); 158 run->kvm_dirty_regs |= KVM_SYNC_DIAG318; 159 } 160 161 rv = _vcpu_run(vcpu); 162 TEST_ASSERT(rv == 0, "vcpu_run failed: %d", rv); 163 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC); 164 TEST_ASSERT(run->s.regs.gprs[11] == 0xBAD1DEA + 1, 165 "r11 sync regs value incorrect 0x%llx.", 166 run->s.regs.gprs[11]); 167 TEST_ASSERT(run->s.regs.acrs[0] == 1 << 11, 168 "acr0 sync regs value incorrect 0x%x.", 169 run->s.regs.acrs[0]); 170 TEST_ASSERT(run->s.regs.diag318 == get_diag318_info(), 171 "diag318 sync regs value incorrect 0x%llx.", 172 run->s.regs.diag318); 173 174 vcpu_regs_get(vcpu, ®s); 175 compare_regs(®s, &run->s.regs); 176 177 vcpu_sregs_get(vcpu, &sregs); 178 compare_sregs(&sregs, &run->s.regs); 179 } 180 181 void test_clear_kvm_dirty_regs_bits(struct kvm_vcpu *vcpu) 182 { 183 struct kvm_run *run = vcpu->run; 184 int rv; 185 186 /* Clear kvm_dirty_regs bits, verify new s.regs values are 187 * overwritten with existing guest values. 188 */ 189 run->kvm_valid_regs = TEST_SYNC_FIELDS; 190 run->kvm_dirty_regs = 0; 191 run->s.regs.gprs[11] = 0xDEADBEEF; 192 run->s.regs.diag318 = 0x4B1D; 193 rv = _vcpu_run(vcpu); 194 TEST_ASSERT(rv == 0, "vcpu_run failed: %d", rv); 195 TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC); 196 TEST_ASSERT(run->s.regs.gprs[11] != 0xDEADBEEF, 197 "r11 sync regs value incorrect 0x%llx.", 198 run->s.regs.gprs[11]); 199 TEST_ASSERT(run->s.regs.diag318 != 0x4B1D, 200 "diag318 sync regs value incorrect 0x%llx.", 201 run->s.regs.diag318); 202 } 203 204 struct testdef { 205 const char *name; 206 void (*test)(struct kvm_vcpu *vcpu); 207 } testlist[] = { 208 { "read invalid", test_read_invalid }, 209 { "set invalid", test_set_invalid }, 210 { "request+verify all valid regs", test_req_and_verify_all_valid_regs }, 211 { "set+verify various regs", test_set_and_verify_various_reg_values }, 212 { "clear kvm_dirty_regs bits", test_clear_kvm_dirty_regs_bits }, 213 }; 214 215 int main(int argc, char *argv[]) 216 { 217 struct kvm_vcpu *vcpu; 218 struct kvm_vm *vm; 219 int idx; 220 221 TEST_REQUIRE(kvm_has_cap(KVM_CAP_SYNC_REGS)); 222 223 ksft_print_header(); 224 225 ksft_set_plan(ARRAY_SIZE(testlist)); 226 227 /* Create VM */ 228 vm = vm_create_with_one_vcpu(&vcpu, guest_code); 229 230 for (idx = 0; idx < ARRAY_SIZE(testlist); idx++) { 231 testlist[idx].test(vcpu); 232 ksft_test_result_pass("%s\n", testlist[idx].name); 233 } 234 235 kvm_vm_free(vm); 236 237 ksft_finished(); /* Print results and exit() accordingly */ 238 } 239